平原 徹

平原 徹 助教
PESとかSTM/Sで忙しいっす。テニスもやります。電気伝導も?まじっすか?

在籍     2003/April/1〜2014/May/31 (2007/Oct - 2014/May: 助教)

修士論文(2005/Mar) Surface transport and photoemission spectroscopy of free-electron like surface states
博士論文(2008/Jan)
Role of spin-orbit interaction and surface states in quantum Bismuth films

現所属
   東京工業大学 大学院 理工学研究科 物性物理学専攻 准教授 (2014/Jun/1-)

投稿論文

2014

  1. M. Aitani, T. Hirahara, and S. Hasegawa:
    In situ Magnetotransport Measurements of Ultrathin Bi films: Evidence for a Surface-Bulk Coherent Transport
    Phys. Rev. Lett, submitted.

  2. N. Nagamura, R. Hobara, T. Uetake, T. Hirahara, M. Ogawa, T. Okuda, K. He, P. Moras, P. M. Sheverdyaeva, C. Carbone, K. Kobayashi, I. Matsuda, and S. Hasegawa:
    Anisotropic Electronic Conduction in Metal Nanofilms Grown on a One-Dimensional Surface Superstructure,
    Phys. Rev. B 89, 125415 (Mar, 2014)

  3. T. Shirasawa, M. Sugiki, T. Hirahara, M. Aitani, T. Shirai, S. Hasegawa, and T. Takahashi:
    Structure and transport properties of Cu doped Bi2Se3 films,
    Phys. Rev. B 89, 195311 (May, 2014)

  4. T. Shirai, T. Shirasawa, T. Hirahara, N. Fukui, T. Takahashi, and S. Hasegawa:
    Structure Determination of Multilayer Silicene Grown on Ag(111) films by Electron Diffraction: Evidence for Ag Segregation at the Surface
    Phys. Rev. B 89, 241403(R) (Jun, 2014) .

2013

  1. M. Yamada, T. Hirahara, and S. Hasegawa:
    Magnetotransport measurements of a superconducting surface state of In- and Pb-induced structures on Si(111)
    Phys. Rev. Lett. 110, 237001 (Jun, 2013).

  2. P. De Padova, P. Vogt, A. Resta, J. Avila, I. Razado-Colambo, C. Quaresima, C. Ottaviani, B. Olivieri, T. Bruhn, T. Hirahara, T. Shirai, S. Hasagawa, M. C. Asensio, and G. Le Lay:
    Evidence of Dirac Fermions in Multilayer Silicene
    Appl. Phys. Lett. 102, 163106 (2013).

  3. T. Tono, T. Hirahara, and S. Hasegawa:
    In situ transport measurements on ultrathin Bi(111) films using a magnetic tip: Possible detection of current-induced spin polarization in the surface states
    New J. Phys. 15, 105018 (Oct 2013)

  4. M. Aitani, Y. Sakamoto, T. Hirahara, M. Yamada, H. Miyazaki, M. Matsunami, S. Kimura, and S. Hasegawa:
    Fermi level tuning of topological insulator thin films
    Jpn. J. Appl. Phys. 52, 110112 (Oct, 2013)


2012

  1. M. D’Angelo, R. Yukawa, K. Ozawa, S. Yamamoto, T. Hirahara, S. Hasegawa, M.G. Silly, F. Sirotti, and I. Matsuda:
    Hydrogen-induced surface metallization of SrTiO3(001)
    Phys. Rev. Lett. 108, 116802 (Mar, 2012).

  2. T. Hirahara, N. Fukui, T. Shirasawa, M. Yamada, M. Aitani, H. Miyazaki, M. Matsunami, S. Kimura, T. Takahashi, S. Hasegawa, and K. Kobayashi:
    Atomic and Electronic Structure of Ultrathin Bi(111) Films Grown on Bi2Te3(111) Substrates: Evidence for a Strain-Induced Topological Phase Transition
    Phys. Rev. Lett. 109, 227401 (Nov, 2012). .

  3. N. Fukui, T. Hirahara, T. Shirasawa, T. Takahashi, K. Kobayashi, and S. Hasegawai:
    Surface Relaxation of Topological Insulators: Influence on the Electronic Structure
    Phys. Rev. B 85, 115426 (Mar, 2012).

  4. T. Uetake, T. Hirahara, Y. Ueda, N. Nagamura, R. Hobara, and S. Hasegawa:
    Anisotropic conductivity of the Si(111)4×1-In surface: Transport mechanism determined by the temperature dependence
    Phys. Rev. B 86, 035325 (Jul, 2012).

  5. Y. Fukaya, I. Matsuda, M. Hashimoto, K. Kubo, T. Hirahara, W. H. Choi, H. W. Yeom, S. Hasegawa, A. Kawasuso, and A. Ichimiya:
    Atomic structure of two-dimensional binary surface alloy: Si(111)-√21×√21 superstructure
    Surface Science 606, 919-923 (Feb, 2012). .

  6. Y. Fukaya, K. Kubo, T. Hirahara, S. Yamazaki, W. H. Choi, H. W. Yeom, A. Kawasuso, S. Hasegawa, and I. Matsuda:
    Atomic and Electronic Structures of Si(111)-√21×√21 Superstructure
    e-Journal of Surface Science and Nanotechnology 10, 310-314 (Jul, 2012).

  7. M. Yamada, T. Hirahara, S. Hasegawa, H. Mizuno, Y. Miyatake, and T. Nagamura:
    Surface Electrical Conductivity Measurement System with Micro-Four-Point Probes at Sub-Kelvin Temperature under High Magnetic Field in Ultrahigh Vacuum
    e-Journal of Surface Science and Nanotechnology 10, 400-405 (Jul, 2012)

  8. S. Hasegawa, T. Hirahara, Y. Kitaoka, S. Yoshimoto, T. Tono, and T. Ohta:
    Nanometer-Scale Four-Point Probe Resistance Measurements of Individual Nanowires by Four-Tip STM
    pp. 153-165 in  Atomic Scale Interconnection Machines, ed.  Christian Joachim (Springer 2012).

2011

  1. T. Hirahara, G. Bihlmayer, Y. Sakamoto, M. Yamada, H. Miyazaki, S. Kimura, S. Bl¨uge, and S. Hasegawa:
    Interfacing 2D and 3D topological insulators: Bi(111) bilayer on Bi2Te3
    Phys. Rev. Lett. 107, 166801 (Oct, 2011). 新聞発表

  2. N. Miyata, R. Hobara, H. Narita, T. Hirahara, S. Hasegawa, and I. Matsuda:
    Development of a surface magneto-transport measurement system with multi-probes and the in situ measurement of Bi nanofilms prepared on Si(111)7×7,
    Japanese Journal of Applied Physics 50, 036602 (Mar, 2011).

  3. N. Miyata, H. Narita, M. Ogawa, A. Harasawa, R. Hobara, T. Hirahara, P. Moras, D.Topwal, C.Carbone, S.Hasegawa, and I. Matsuda:
    Enhanced spin relaxation in a quantum metal film by the Rashba-type surface,
    Physical Review B83, 195305 (May, 2011).

  4. Yuki Saisyu, Toru Hirahara, Rei Hobara, and Shuji Hasegawa:
    Magnetic anisotropy of Co ultrathin films
    Journal of Applied Physics 110, 053902 (Sep, 2011).

  5. 長谷川修司、平原徹:
    トポロジカル絶縁体は本当か ―実験から見て―
    表面科学 32, 216-225 (Apr, 2011).

  6. 平原徹:
    トポロジカル絶縁体超薄膜の電子構造
    分子研レターズ 63, 34-35 (Feb, 2011).


2010

  1. T. Shibasaki, N. Nagamura, T. Hirahara, .H. Okino, S. Yamazaki, W. Lee, H. Shim, R. Hobara, I. Matsuda, G. . S. Lee, and S. Hasegawa:
    Phase transition temperatures determined by different experimental methods: Si(111)4x1-In surface with defects,
    Phys. Rev. B81, 035314 (Jan, 2010).


  2. T .Hirahara, Y. Sakamoto, Y. Saisyu, H. Miyazaki, S. Kimura, T. Okuda, I. Matsuda, S. Murakami, and S. Hasegawa:
    A topological metal at the surface of an ultrathin Bi1-xSbx alloy film,
    Phys. Rev. B81, 165422 (Apr, 2010).

  3. Y. Sakamoto, T. Hirahara, H. Miyazaki, S. Kimura, and S. Hasegawa:
    Spectroscopic evidence of a topological quantum phase transition in ultrathin Bi2Se3 films,
    Phys. Rev. B81, 165432 (Apr, 2010).

  4. H. Morikawa, K. S. Kim, H. W. Yeom, Y. Kitaoka, T. Hirahara, and S. Hasegawa:
    Conductance transition and interwire ordering of Pb nanowires on Si(557),
    Phys. Rev. B 82, 045423 (Jul, 2010).

  5. Y. Niinuma, Y. Saisyu, T. Hirahara, R. Hobara, S. Hasegawa, H. Mizuno, and T. Nagamura:
    Development of an UHV-SMOKE system using permanent magnets
    e-Journal of Surface Science and Nanotechnology 8, 298-302 (June, 2010). .

  6. T. Hirahara, Y. Sakamoto, Y. Takeichi, H. Miyazaki, S. Kimura, I. Matsuda, A. Kakizaki, S. Hasegawa,
    Anomalous transport in an n-type topological insulator ultrathin Bi2Se3 film,
    Phys. Rev. B82, 155309 (Oct, 2010).

  7. I. Matsuda, K. Kubo, T. Hirahara, S. Yamazaki, W. H. Choi, H. W. Yeom, H. Narita, Y. Fukaya, M. Hashimoto, A. Kawasuso, S. Hasegawa, and K. Kobayashi:
    Electron compound nature in a surface atomic layer of two-dimensional hexagonal lattice,
    Phys. Rev. B 82, 165330 (Nov, 2010).

  8. 村上修一、平原徹、松田巌:
    トポロジカル絶縁体の物理
    日本物理学会誌 65(11), 840-848 (Nov, 2010)

  9. 武市泰男、何珂、奥田太一、平原徹、柿崎明人、松田巌:
    ラシュバ分裂した表面状態との混成により誘起された金属量子井戸状態のスピン分裂
    表面科学 31(9), 493-499 (Sep, 2010)

2009

  1. M. D’angelo, K. Takase, T. Hirahara, S. Hasegawa, and I. Matsuda:
    Conductivity of the Si(111)7×7 dangling-bond state
    Phys. Rev. B 79, 035318 (Jan, 2009).

  2. Y. Kitaoka, T. Tono, S. Yoshimoto, T. Hirahara, S. Hasegawa, and T. Ohba:
    Direct detection of grain boundary scattering in damascene Cu wires by nanometer-scale four-point probe resistance measurements,
    Appl. Phys. Lett. 95, 052110 (Aug, 2009).

  3. T. Hirahara, T. Komorida, Y. Gu, F. Nakamura, H. Izuchi, H. Morikawa, and S. Hasegawa:
    Insulating conduction in Sn/Si(111): Possibility of a Mott insulating ground state and metallization/localization induced by carrier doping,
    Phys. Rev. B 80, 235419 (Dec, 2009).

  4. Y. Kitaoka, S. Yoshimoto, T. Hirahara, S. Hasegawa, T. Ohba:
    Nanometer-scale Four-Point Probe Resistance Measurements of Cu Wires Using Carbon Nanotube Tips
    Advanced Metallization Conference 2009, Eds. M. Naik, R. Shaviv, T. Yoda, and K. Ueno, Mat. Res. Soc., pp. 295-299.


  5. 平原徹、松田巌、山崎詩郎、長谷川修司:
    ビスマス量子薄膜における表面状態による電気伝導
    表面科学 30, 374-379 (Jul, 2009).

  6. 平原徹:
    ビスマス超薄膜の電子構造:Rashba効果と量子サイズ効果及びその協奏

    真空 52, 582-588 (Nov, 2009).

2008

  1. K. He, T. Hirahara, T. Okuda, S. Hasegawa, A. Kakizaki, and I. Matsuda:
    Spin-polarization of quantum well states in Ag films induced by Rashba effect at surface
    Physical Review Letters, 101, 107604 (Sep, 2008).

  2. T. Hirahara, T. Komorida, A. Sato, G. Bihlmayer, E. V. Chulkov, K. He, I. Matsuda, and S. Hasegawa:
    Manipulating quantum-well states by surface alloying: Pb on ultrathin Ag films,
    Physical Review B 78, 035408 (Jul 2008).

  3. N. Miyata, K. Horikoshi, T. Hirahara, S. Hasegawa, C. M. Wei, and I. Matsuda:
    Electron Transport Property of Quantum-Well States in Ultrathin Pb (111) Films
    Phys. Rev. B 78, 245405 (Dec, 2008).

  4. T Hirahara, K. Miyamoto, A. Kimura, Y. Niinuma, G. Bihlmayer, E. V. Chulkov, T. Nagao, I. Matsuda, S. Qiao, K. Shimada, H. Namatame, M. Taniguchi, and S. Hasegawa:
    Origin of the surface-state band-splitting in ultrathin Bi Flms: From a Rashba effect to a parity effect,
    New Journal of Physics 10, 083038 (Aug 2008).

  5. C. Liu, I. Matsuda, T. Hirahara, S. Hasegawa, J. Okabayashi, S. Toyoda, and M. Oshima:
    Band-bending inhomogeneity of Au adsorbed Si(111)-√3×√3-Ag evaluated with Si 2p core-level spectra
    Surface Science 602, 3316 (2008).

2007

  1. I. Matsuda, C. Liu, T. Hirahara, M. Ueno,T. Tanikawa, T. Kanagawa, R.Hobara, S. Yamazaki, S. Hasegawa, and K. Kobayashi:
    Electron-phonon interaction and localization of surface-state carriers in a metallic monolayer
    Physical Review Letters 99, 146805 (Oct 2007).

  2. H. Kakuta, T. Hirahara, I. Matsuda, T. Nagao, S. Hasegawa, N. Ueno, and K. Sakamoto:
    Electronic structures of the highest occupied molecular orbital bands of a pentacene ultrathin film
    Physical Review Letters 98, 247601 (2007).

  3. Y. Nakayama, S. Yamazaki, H. Okino, T. Hirahara, I. Matsuda, S. Hasegawa, and M. Ichikawa:
    Electrical conduction of Ge nanodot arrays formed on an oxidized Si surface,
    Applied Physcs Letters 91,123104 Sep 2007).

  4. T. Hirahara, I. Matsuda, S. Yamazaki, N. Miyata, T. Nagao, and S. Hasegawa:
    Large surface-state conductivity in ultrathin Bi films
    Appl. Phys. Lett. 91, 202106 (Nov 2007).

  5. T. Hirahara, T. Nagao, I. Matsuda, G. Bihlmayer, E. V. Chulkov, Yu. M. Koroteev, and S. Hasegawa:
    Quantum-well states in ultrathin Bi films from angle-resolved photoemission spectroscopy and first-principles calculations study
    Physical Review B 75, 035422 (Jan, 2007).

  6. T. Hirahara, K. Miyamoto, I. Matsuda, T. Kadono, A. Kimura, T. Nagao, G. Bihlmayer, E. V. Chulkov, S. Qiao, K. Shimada, H. Namatame, M. Taniguchi, and S. Hasegawa:
    Direct Observation of Spin Splitting in Bismuth Surface States
    Physical Review B 76,153305 (Oct 2007).


2006


  1. N. Nagamura, I. Matsuda, N. Miyata, T. Hirahara, S. Hasegawa, and T. Uchihashi:
    Quasi-quantum-wire states in an epitaxial Ag film on a one-dimensional surface superstructure
    Phys. Rev. Lett. 96, 256801 (June, 2006).

  2. T. Hirahara, T. Nagao, I. Matsuda, G. Bihlmayer, E. V. Chulkov, Yu. M. Koroteev, P. M. Echenique, M. Saito, and S. Hasegawa
    Role of Spin-Orbit Coupling and Hybridization Effects in the Electronic Structure of Ultrathin Bi Films
    Phys. Rev. Lett. 97, 146803 (October, 2006).

  3. T. Hirahara, I. Matsuda, R. Hobara, S. Yoshimoto, and S. Hasegawa:
    Direct measurement of the Hall effect in a free-electron-like surface state
    Phys. Rev. B 73, 235332 (June, 2006).

  4. I. Matsuda, T. Hirahara, M. Ueno, R. Hobaram and S. Hasegawa
    Electrical Conduction through a Monatomic Step
    Journal de Physique IV 132, 57 (April 2006).

2005

  1. I. Matsuda,. T. Hirahara, M. Konishi, C. Liu, H. Morikawa, M. D'angelo, S. Hasegawa, T. Okuda, and T. Kinoshita:
    Evolution of Fermi surface by electron doping into a free-electron-like surface state,
    Physical Review B71, 235315 (June, 2005).

  2. N. Miyata, I. Matsuda,. M. D'angelo, H. Morikawa, T. Hirahara, and S. Hasegawa:
    STM observation of the Si(111)-c(12×2)-Ag surface
    e-Journal of Surface Science and Nanotechnology 3, 151-155 (May, 2005).

学会発表 【招待講演】

  1. T. Hirahara:
    Ultrathin films of topological insulators,
    IMS workshop on Advanced Spectroscopy of Correlated Materials (ASCM 13),
    2013 年8 月6 日(分子研, 岡崎).

  2. 平原徹:
    シリセンに関する実験の現状,
    日本物理学会2013 年度秋季大会領域4,6,7 合同シンポジウム「トポロジカル絶縁体・超伝導体の新物質・新成長法・新構造」,
    2013 年9 月(徳島大学, 徳島).

  3. T. Hirahara:
    Topological Quantum Phase Transitions in Ultrathin Films
    The 14th International Conference on the Formation of Semiconductor Interfaces (ICFSI-14)
    2013年7月2日, Gyeongju, Korea.


  4. 平原徹:
    ビスマスはトポロジカル物質か?,
    科研費基盤研究A「固体中のディラック電子」第3 回研究会、
    2013 年12 月(赤穂温泉, 兵庫).

  5. T. Hirahara:
    Charge and Spin Transport at Nonmagnetic Surfaces
    Energy Materials Nanotechnology (EMN)West Meeting), 2013年1月7日 (Houston, USA).


  6. 平原徹:
    放射光で拓く表面物質科学の新展開

    所長招聘研究会 「2020 年の光分子科学を語る」 2013 年1 月23 日 (分子科学研究所).


  7. 平原徹:
    ビスマスおよびビスマス系化合物超薄膜の実験的研究,
    科研費基盤研究A「固体中のディラック電子」第1 回研究会,
    2012 年7 月25 日(東京大本郷).

  8. T. Hirahara:
    Comprehensive study of topological phase transitions using ultrathin films

    International Conferenceof Young Researchers on Advanced Materials(ICYRAM), 2012年7月3日, Singapore.


  9. 平原徹:
    非磁性体超薄膜のスピン偏極表面電子状態,
    UVSORIII における低エネルギー光電子分光の新展開,
    2012 年6 月21 日(分子科学研究所).

  10. 平原徹:(22aRC-6)
    ラシュバ・トポロジカル表面系の輸送特性 /Transport properties of Rashba and topological surfaces
    日本物理学会 2011年秋季大会、シンポジウム「多彩な表面系における電子輸送現象 /Electron Transport Phenomena on Surface Systems - Interdisciplinary Approach」、2011922日, 富山大学.


  11. T. Hirahara and S. Hasegawa:
    Surface States of Rashba Spin-Split Type and Topological Insulators,
    Korean Physical Society Spring Meeting
    , 2010年4月21日、Daejon (Korea).


  12. T. Hirahara:
    Ultrathin films of topological insulators
    JSPS A3 Foresight Program Autumn School for Young Scientist
    , 2010年11月10日, 京都.


  13. 平原徹:
    ビスマス量子薄膜における表面状態による電気伝導
    第30 回表面科学学術講演会奨励賞受賞記念講演
    2010115日, 大阪大学.


  14. 坂本裕介、平原徹、宮崎秀俊、木村真一、長谷川修司:
    ビスマス量子薄膜における表面状態による電気伝導
    Bi2Se3 超薄膜における量子トポロジカル相転移
    20101210日, 東京工業大学.


  15. T. Hirahara:
    Ultrathin films of topological insulators
    Materials Science Division Seminar, Argonne National Laboratory
    , 2010年10月11日, ANL (米国).

  16. 平原徹:
    ビスマスおよびビスマス系化合物超薄膜における電荷・スピン伝導
    東京大学物性研究所放射光セミナー
    , 2010年11月26日, 東大物性研 (柏).

  17. T. Hirahara:
    The Rashba and quantum size effects in ultrathin Bi films,
    Deutsche Physical Gesellschaft Spring Meeting, 2009年3月27日、Dresden (Germany)

  18. T. Hirahara, Y. Kitaoka, T. Tono, S. Yoshimoto, T. Ohba, and S. Hasegawa::
    Direct detection of grain boundary scattering in damascene Cu wires by nanoscale four-point probe resistance measurement

    IUPAC The5th International Symposium on Novel Materials and Synthesis (NMS-V), 2009 年10 月18-22 日 (Shanghai, China).

  19. 平原徹:
    ビスマス超薄膜のスピン偏極表面電子状態、電気伝導特性に関する研究
    日本物理学会第64回年次大会 第3回領域9若手奨励賞受賞講演,
    2009年3月28日、立教大学.

  20. 平原徹:
    Bi超薄膜におけるRashba効果と量子サイズ効果
    日本物理学会第63回年次大会 領域9領域3合同シンポジウム「反対称性の破れた表面におけるスピンと軌道」,
    2008年3月24日、近畿大学.